- Genesis Hire Ltd - London
- Genesis Signs & Print - London
- GenieoWeb - London
- Gensys Technology Ltd - London
- Genzed Technologies Ltd - London
- Geo W. Neale Ltd - London
- Geomiq - London
- Geotechnical Consulting Group - London
- GEOTHERMAL (UK) LIMITED - London
- Gerald Edelman - London - London
- Get It Cleaned - London
- Get It Made Ltd - London
- Get Licensed - London
- GETSCANNED LTD - London
- GETVAN - London
- GH Zeal Ltd - London
- GHA Group - London
- Ghir Electrical Supplies Ltd - London
- Ghost Hunt Events Ltd - London
- Ghummans Group - London
- Giant Leap Digital - London
- Giant Screening Ltd - London
- Gideon Hart Photography - London
- Gift Boxed Company - London
- Gillieron Scott Acoustic Design - London
- Gilmex International Ltd - London
- Gina Shoes - London
- Glass Designs - London
- Glass Mirror House Ltd - London
- Glass Partitioning UK - London
- Glass Partitions Direct - London
- GlasSpace - London
- GlassSpace - London
- Gleave & Co. - London
- Gleeds UK - London
- Glen Creston Ltd - London
- Glo wellbeing - London
- Global - London
- Global Action Plan - London
- Global Forwarding - London
- Global Lingo Ltd - London
- Global Network CCTV Ltd - London
- Global Witness - London
- Glopack - London
- Go All Secure - London
- Go Custom Boxes - London
- Go Native Ltd - London
- Go Wristbands - London
- GoCustomBoxes - london
- GoDelve - London
Companies 1601 to 1650
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